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I have a 2007. It has 64k miles on it, bought it Jan 2010 with 36k miles. I've had one HPFP go out, and dead battery shortly after I bought it, and replaced spark plugs summer 2011 but since then nothing major. I've replaced burned out angel eyes twice and the tail light socket once. TPMS is currently not functioning, but I just ignore it.

Here's what I've put into my 2006 BMW 330i over the past year (currently @ 92k miles): Spark Plugs, Rear brakes and rotors, Water pump and thermostat, Battery - all original equipment except brakes. Grand total = $2000+ at my local indy shop. This does not include $100 oil changes or tires. Also keep in mind that "lifetime" transmission fluid should generally be replaced at 100k, another $400 flushed (pun intended).

This was an exceptional year, the car has been largely problem free until now. But the point is that when you enter the 50k-100k range there are certain parts that reach the end of their useful life, and my average has been $1k/yr in maintenance & repairs since 50k warranty expired. So if prior owner has not replaced you will be looking at some expense. Ergo I would not buy a BMW with 85k miles unless you have the resources to fund sudden but inevitable repairs.

To be fair this is my daily driver, and it had never broken down except for the dead battery (which signaled its impending demise). And the RFTs spare you the inconvenience of changing a tire roadside on the way to work (simply drive to a tire shop later at your convenience). So at this point I don't plan to dump it, but then again it is paid for. Even with $2k this year I still come out way ahead v. payments for a new model. Though I am jonesing for a M6 sedan